Looks to me like the dems are worried about losing Blacks to Trump. That got Biden where he is, but the dumb fuck blew it up with his, "you ain't black" line.
Tulsi blew Harris up by revealing Harris's treatment of Black prisoners in CA.
Blacks don"t like Warren or Bernie. Clinton is probably the best white person besides Biden who can hold blacks. She"ll play that card hard, too, to blow up any candidate who doesn't pay her tribute if she doesn"t run herself.
Dems have Mike, Abrams and Oprah, otherwise. to hold the Blacks.
I think Pence will be replaced by Nikki Haley. Haley can handle any dem VP candidate easily. Tim Scott can go toe to toe with Clyburn in SC as well. Remember Carville saying Clyburn saved the Democratic Party when he went all for Biden? For some reason that's an important nexus. If Trump can neutralize that and pull in Blacks he'll be golden.